Strange, I feel almost the same way when I'm waiting behind one of those people. Minus the wanting them to go to jail part, that's a bit much.
But seriously, I consider metro hallways/moving walkways and escalators the same as highways. You should keep right if you're walking slowly or standing still, and leave the left side open for passing. I get infuriated every day at people making my hour and a half commute longer by just standing there stupidly, or taking up two "lanes."
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